Karen Lindsfor, a professor of radiology and chief of breast imaging at the University of California, Davis Medical Center, examines the mammogram of a patient with heterogeneously dense breast tissue. Lindfors is among those doctors who say there was insufficient evidence to support the idea that additional screenings would detect cancers earlier. Rich Pedroncelli/AP hide caption

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A vintage ad for a headache remedy plays to women. The National Library of Medicine hide caption

itoggle caption The National Library of Medicine

The problem of breast cancer overdiagnosis with mammograms is similar to the dilemma faced by men diagnosed with prostate cancer because of a PSA test. Damian Dovarganes/AP hide caption

itoggle caption Damian Dovarganes/AP

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Midwife Erin Fulham, left, takes care of Shannon Earle and her new baby Kiera. Daughter Riana, the father, Patrick, and his mother, Ann Earle, look on at the family's home in Takoma Park, Md., in 2011. Amanda Steen/NPR hide caption

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